Which gas to use

[JCL]

Posted links that are searches generally don't work

Canada requires 5% ethanol minimum, averaged across all sales. Usually that is achieved by 10% ethanol in the 87 and no ethanol in the 91, with the 89 being blended at the pump, resulting in 5% ethanol in it. If the station sells 94 then it is ethanol free, and the 91 will have some ethanol. If the pumps aren't blending pumps then all grades could have ethanol.

Ethanol isn't good for some fuel system components, attracts water which reduces the octane rating, and reduces your mileage. It also raises the price of food and promotes a culture of subsidies. Personally, I try to buy fuels with no ethanol.

I like Chevron (refinery is here in Vancouver) or Esso. Shell if I have to. Petrocanada only if I am really stuck. No one else, especially not Costco, Superstore, Husky, or the second tier brands.